DELETING BLANK LINES USING GREP

To delete a blank line using a grep command you can use the next
command :-

grep -v "^ *$" file-y > file-x

where file-y is the input files has blank lines and file-x will
be the output file ( excluding the blank lines ).

if we use ( grep -v "^$" ) only , the blanck line which include
spaces will not be removed.

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